71421306 has 16 divisors (see below), whose sum is σ = 155828448. Its totient is φ = 21642800.

The previous prime is 71421289. The next prime is 71421307. The reversal of 71421306 is 60312417.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71421307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541005 + ... + 541136.

It is an arithmetic number, because the mean of its divisors is an integer number (9739278).

Almost surely, 2^71421306 is an apocalyptic number.

71421306 is an abundant number, since it is smaller than the sum of its proper divisors (84407142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71421306 is a wasteful number, since it uses less digits than its factorization.

71421306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082157.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 71421306 is about 8451.1127078036. The cubic root of 71421306 is about 414.8991984335.

Subtracting from 71421306 its reverse (60312417), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 7142 and 1306, that added together give a palindrome (8448).

The spelling of 71421306 in words is "seventy-one million, four hundred twenty-one thousand, three hundred six".